S-93604A641 5/16"-18 x 1" ASTM A307, ASTM A153, ASME B18.5 Carriage Bolts

Key Features & Benefits at a Glance

• Superior corrosion protection with hot-dipped galvanized steel coating for extended service life in harsh environments
• Exceptional tensile strength of 60,000 PSI ensures reliable performance under heavy loads and stress conditions
• Secure anti-rotation design with square neck that prevents spinning during installation and maintains alignment
• Optimized thread engagement with fully threaded 5/16"-18 UNC coarse threads for maximum holding power
• Enhanced installation efficiency with rounded head profile that provides smooth surface contact and right-hand threading
• Consistent quality assurance through Rockwell B70 hardness rating and Class 2A thread fit for precision assembly
• Regulatory compliance meeting ASTM A307, ASTM A153, and ASME B18.5 standards for industrial applications

Professional Applications & Engineering Value

These hot-dipped galvanized carriage bolts deliver exceptional value in demanding industrial settings where corrosion resistance and structural integrity are paramount. The Grade 2 classification combined with 60,000 PSI tensile strength makes them ideal for construction, agricultural equipment, and structural framing applications. The square neck design provides crucial anti-rotation capability during installation, preventing costly rework and ensuring proper alignment in wood-to-metal and structural connections. The fully threaded 5/16"-18 UNC coarse thread configuration offers superior pull-out resistance while the rounded head profile creates a finished appearance and eliminates sharp edges in exposed applications. This combination of features addresses common challenges in outdoor infrastructure, marine environments, and industrial machinery where moisture, chemicals, and weather exposure typically compromise fastener performance.

Specification Summary & Compliance

This carriage bolt features precise Class 2A thread fit with 5/16"-18 UNC coarse threading and right-hand direction. Manufacturing complies with ASTM A307 specifications for low carbon steel structural bolts, ASTM A153 for zinc coating (hot-dip), and ASME B18.5 dimensional standards. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting current environmental regulations for industrial components.